Four people appeared in the Taihape District Court on Monday on a total of 30 charges, police say.
Two men and two women were arrested following search warrants executed on February 11. Their charges relate to drug dealing, and one charge is for unlawfully possessing a firearm.
Members of the public gave information to police about drugs allegedly being supplied to young people in the town, which led to an investigation.
"While the arrest of these four individuals is progress in the fight against drugs in our community, police will continue to target people who sell drugs in our community," Senior Constable Tony Lomas said.
The four defendants, aged between 32 and 47, were all remanded in custody.